[quote=dwesteused in come communities to generally refer to whatever or whoever poses the biggest threat [/quote]

I also hadn't heard the term used this way before, but it makes sense to me- it's why the guys going grey stick out to me. They try to blend in, but something is off about them. It's like looking for unmarked police cars- look for the same basic model they use for patrol or a low-mid cost sedan or light SUV in a neutral color, with extra antennas and junk on the dashboard.